1 /*-
2 * Copyright (c) 2013, Stacey D. Son
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: releng/10.1/sys/kern/imgact_binmisc.c 272450 2014-10-02 21:19:13Z sbruno $");
29
30 #include <sys/param.h>
31 #include <sys/ctype.h>
32 #include <sys/sbuf.h>
33 #include <sys/systm.h>
34 #include <sys/sysproto.h>
35 #include <sys/exec.h>
36 #include <sys/imgact.h>
37 #include <sys/imgact_binmisc.h>
38 #include <sys/kernel.h>
39 #include <sys/libkern.h>
40 #include <sys/lock.h>
41 #include <sys/malloc.h>
42 #include <sys/mutex.h>
43 #include <sys/sysctl.h>
44
45 /**
46 * Miscellaneous binary interpreter image activator.
47 *
48 * If the given target executable's header matches 'xbe_magic' field in the
49 * 'interpreter_list' then it will use the user-level interpreter specified in
50 * the 'xbe_interpreter' field to execute the binary. The 'xbe_magic' field may
51 * be adjusted to a given offset using the value in the 'xbe_moffset' field
52 * and bits of the header may be masked using the 'xbe_mask' field. The
53 * 'interpreter_list' entries are managed using sysctl(3) as described in the
54 * <sys/imgact_binmisc.h> file.
55 */
56
57 /*
58 * Node of the interpreter list.
59 */
60 typedef struct imgact_binmisc_entry {
61 char *ibe_name;
62 uint8_t *ibe_magic;
63 uint32_t ibe_moffset;
64 uint32_t ibe_msize;
65 uint8_t *ibe_mask;
66 uint8_t *ibe_interpreter;
67 uint32_t ibe_interp_argcnt;
68 uint32_t ibe_interp_length;
69 uint32_t ibe_flags;
70 SLIST_ENTRY(imgact_binmisc_entry) link;
71 } imgact_binmisc_entry_t;
72
73 /*
74 * sysctl() commands.
75 */
76 #define IBC_ADD 1 /* Add given entry. */
77 #define IBC_REMOVE 2 /* Remove entry for a given name. */
78 #define IBC_DISABLE 3 /* Disable entry for a given name. */
79 #define IBC_ENABLE 4 /* Enable entry for a given name. */
80 #define IBC_LOOKUP 5 /* Lookup and return entry for given name. */
81 #define IBC_LIST 6 /* Get a snapshot of the interpretor list. */
82
83 /*
84 * Interpreter string macros.
85 *
86 * They all start with '#' followed by a single letter:
87 */
88 #define ISM_POUND '#' /* "##" is the escape sequence for single #. */
89 #define ISM_OLD_ARGV0 'a' /* "#a" is replaced with the old argv0. */
90
91 MALLOC_DEFINE(M_BINMISC, KMOD_NAME, "misc binary image activator");
92
93 /* The interpreter list. */
94 static SLIST_HEAD(, imgact_binmisc_entry) interpreter_list =
95 SLIST_HEAD_INITIALIZER(interpreter_list);
96
97 static int interp_list_entry_count = 0;
98
99 static struct mtx interp_list_mtx;
100
101 int imgact_binmisc_exec(struct image_params *imgp);
102
103
104 /*
105 * Populate the entry with the information about the interpreter.
106 */
107 static void
108 imgact_binmisc_populate_interp(char *str, imgact_binmisc_entry_t *ibe)
109 {
110 uint32_t len = 0, argc = 1;
111 char t[IBE_INTERP_LEN_MAX];
112 char *sp, *tp;
113
114 bzero(t, sizeof(t));
115
116 /*
117 * Normalize interpreter string. Replace white space between args with
118 * single space.
119 */
120 sp = str; tp = t;
121 while (*sp != '\0') {
122 if (*sp == ' ' || *sp == '\t') {
123 if (++len > IBE_INTERP_LEN_MAX)
124 break;
125 *tp++ = ' ';
126 argc++;
127 while (*sp == ' ' || *sp == '\t')
128 sp++;
129 continue;
130 } else {
131 *tp++ = *sp++;
132 len++;
133 }
134 }
135 *tp = '\0';
136 len++;
137
138 ibe->ibe_interpreter = malloc(len, M_BINMISC, M_WAITOK|M_ZERO);
139
140 /* Populate all the ibe fields for the interpreter. */
141 memcpy(ibe->ibe_interpreter, t, len);
142 ibe->ibe_interp_argcnt = argc;
143 ibe->ibe_interp_length = len;
144 }
145
146 /*
147 * Allocate memory and populate a new entry for the interpreter table.
148 */
149 static imgact_binmisc_entry_t *
150 imgact_binmisc_new_entry(ximgact_binmisc_entry_t *xbe)
151 {
152 imgact_binmisc_entry_t *ibe = NULL;
153 size_t namesz = min(strlen(xbe->xbe_name) + 1, IBE_NAME_MAX);
154
155 mtx_assert(&interp_list_mtx, MA_NOTOWNED);
156
157 ibe = malloc(sizeof(*ibe), M_BINMISC, M_WAITOK|M_ZERO);
158
159 ibe->ibe_name = malloc(namesz, M_BINMISC, M_WAITOK|M_ZERO);
160 strlcpy(ibe->ibe_name, xbe->xbe_name, namesz);
161
162 imgact_binmisc_populate_interp(xbe->xbe_interpreter, ibe);
163
164 ibe->ibe_magic = malloc(xbe->xbe_msize, M_BINMISC, M_WAITOK|M_ZERO);
165 memcpy(ibe->ibe_magic, xbe->xbe_magic, xbe->xbe_msize);
166
167 ibe->ibe_mask = malloc(xbe->xbe_msize, M_BINMISC, M_WAITOK|M_ZERO);
168 memcpy(ibe->ibe_mask, xbe->xbe_mask, xbe->xbe_msize);
169
170 ibe->ibe_moffset = xbe->xbe_moffset;
171 ibe->ibe_msize = xbe->xbe_msize;
172 ibe->ibe_flags = xbe->xbe_flags;
173
174 return (ibe);
175 }
176
177 /*
178 * Free the allocated memory for a given list item.
179 */
180 static void
181 imgact_binmisc_destroy_entry(imgact_binmisc_entry_t *ibe)
182 {
183 if (!ibe)
184 return;
185 if (ibe->ibe_magic)
186 free(ibe->ibe_magic, M_BINMISC);
187 if (ibe->ibe_mask)
188 free(ibe->ibe_mask, M_BINMISC);
189 if (ibe->ibe_interpreter)
190 free(ibe->ibe_interpreter, M_BINMISC);
191 if (ibe->ibe_name)
192 free(ibe->ibe_name, M_BINMISC);
193 if (ibe)
194 free(ibe, M_BINMISC);
195 }
196
197 /*
198 * Find the interpreter in the list by the given name. Return NULL if not
199 * found.
200 */
201 static imgact_binmisc_entry_t *
202 imgact_binmisc_find_entry(char *name)
203 {
204 imgact_binmisc_entry_t *ibe;
205
206 mtx_assert(&interp_list_mtx, MA_OWNED);
207
208 SLIST_FOREACH(ibe, &interpreter_list, link) {
209 if (strncmp(name, ibe->ibe_name, IBE_NAME_MAX) == 0)
210 return (ibe);
211 }
212
213 return (NULL);
214 }
215
216 /*
217 * Add the given interpreter if it doesn't already exist. Return EEXIST
218 * if the name already exist in the interpreter list.
219 */
220 static int
221 imgact_binmisc_add_entry(ximgact_binmisc_entry_t *xbe)
222 {
223 imgact_binmisc_entry_t *ibe;
224 char *p;
225
226 if (xbe->xbe_msize > IBE_MAGIC_MAX)
227 return (EINVAL);
228
229 for(p = xbe->xbe_name; *p != 0; p++)
230 if (!isascii((int)*p))
231 return (EINVAL);
232
233 for(p = xbe->xbe_interpreter; *p != 0; p++)
234 if (!isascii((int)*p))
235 return (EINVAL);
236
237 /* Make sure we don't have any invalid #'s. */
238 p = xbe->xbe_interpreter;
239 while (1) {
240 p = strchr(p, '#');
241 if (!p)
242 break;
243
244 p++;
245 switch(*p) {
246 case ISM_POUND:
247 /* "##" */
248 p++;
249 break;
250
251 case ISM_OLD_ARGV0:
252 /* "#a" */
253 p++;
254 break;
255
256 case 0:
257 default:
258 /* Anything besides the above is invalid. */
259 return (EINVAL);
260 }
261 }
262
263 mtx_lock(&interp_list_mtx);
264 if (imgact_binmisc_find_entry(xbe->xbe_name) != NULL) {
265 mtx_unlock(&interp_list_mtx);
266 return (EEXIST);
267 }
268 mtx_unlock(&interp_list_mtx);
269
270 ibe = imgact_binmisc_new_entry(xbe);
271 if (!ibe)
272 return (ENOMEM);
273
274 mtx_lock(&interp_list_mtx);
275 SLIST_INSERT_HEAD(&interpreter_list, ibe, link);
276 interp_list_entry_count++;
277 mtx_unlock(&interp_list_mtx);
278
279 return (0);
280 }
281
282 /*
283 * Remove the interpreter in the list with the given name. Return ENOENT
284 * if not found.
285 */
286 static int
287 imgact_binmisc_remove_entry(char *name)
288 {
289 imgact_binmisc_entry_t *ibe;
290
291 mtx_lock(&interp_list_mtx);
292 if ((ibe = imgact_binmisc_find_entry(name)) == NULL) {
293 mtx_unlock(&interp_list_mtx);
294 return (ENOENT);
295 }
296 SLIST_REMOVE(&interpreter_list, ibe, imgact_binmisc_entry, link);
297 interp_list_entry_count--;
298 mtx_unlock(&interp_list_mtx);
299
300 imgact_binmisc_destroy_entry(ibe);
301
302 return (0);
303 }
304
305 /*
306 * Disable the interpreter in the list with the given name. Return ENOENT
307 * if not found.
308 */
309 static int
310 imgact_binmisc_disable_entry(char *name)
311 {
312 imgact_binmisc_entry_t *ibe;
313
314 mtx_lock(&interp_list_mtx);
315 if ((ibe = imgact_binmisc_find_entry(name)) == NULL) {
316 mtx_unlock(&interp_list_mtx);
317 return (ENOENT);
318 }
319
320 ibe->ibe_flags &= ~IBF_ENABLED;
321 mtx_unlock(&interp_list_mtx);
322
323 return (0);
324 }
325
326 /*
327 * Enable the interpreter in the list with the given name. Return ENOENT
328 * if not found.
329 */
330 static int
331 imgact_binmisc_enable_entry(char *name)
332 {
333 imgact_binmisc_entry_t *ibe;
334
335 mtx_lock(&interp_list_mtx);
336 if ((ibe = imgact_binmisc_find_entry(name)) == NULL) {
337 mtx_unlock(&interp_list_mtx);
338 return (ENOENT);
339 }
340
341 ibe->ibe_flags |= IBF_ENABLED;
342 mtx_unlock(&interp_list_mtx);
343
344 return (0);
345 }
346
347 static int
348 imgact_binmisc_populate_xbe(ximgact_binmisc_entry_t *xbe,
349 imgact_binmisc_entry_t *ibe)
350 {
351 uint32_t i;
352
353 mtx_assert(&interp_list_mtx, MA_OWNED);
354
355 bzero(xbe, sizeof(*xbe));
356 strlcpy(xbe->xbe_name, ibe->ibe_name, IBE_NAME_MAX);
357
358 /* Copy interpreter string. Replace NULL breaks with space. */
359 memcpy(xbe->xbe_interpreter, ibe->ibe_interpreter,
360 ibe->ibe_interp_length);
361 for(i = 0; i < (ibe->ibe_interp_length - 1); i++)
362 if (xbe->xbe_interpreter[i] == '\0')
363 xbe->xbe_interpreter[i] = ' ';
364
365 memcpy(xbe->xbe_magic, ibe->ibe_magic, ibe->ibe_msize);
366 memcpy(xbe->xbe_mask, ibe->ibe_mask, ibe->ibe_msize);
367 xbe->xbe_version = IBE_VERSION;
368 xbe->xbe_flags = ibe->ibe_flags;
369 xbe->xbe_moffset = ibe->ibe_moffset;
370 xbe->xbe_msize = ibe->ibe_msize;
371
372 return (0);
373 }
374
375 /*
376 * Retrieve the interpreter with the give name and populate the
377 * ximgact_binmisc_entry structure. Return ENOENT if not found.
378 */
379 static int
380 imgact_binmisc_lookup_entry(char *name, ximgact_binmisc_entry_t *xbe)
381 {
382 imgact_binmisc_entry_t *ibe;
383 int error = 0;
384
385 mtx_lock(&interp_list_mtx);
386 if ((ibe = imgact_binmisc_find_entry(name)) == NULL) {
387 mtx_unlock(&interp_list_mtx);
388 return (ENOENT);
389 }
390
391 error = imgact_binmisc_populate_xbe(xbe, ibe);
392 mtx_unlock(&interp_list_mtx);
393
394 return (error);
395 }
396
397 /*
398 * Get a snapshot of all the interpreter entries in the list.
399 */
400 static int
401 imgact_binmisc_get_all_entries(struct sysctl_req *req)
402 {
403 ximgact_binmisc_entry_t *xbe, *xbep;
404 imgact_binmisc_entry_t *ibe;
405 int error = 0, count;
406
407 mtx_lock(&interp_list_mtx);
408 count = interp_list_entry_count;
409 /* Don't block in malloc() while holding lock. */
410 xbe = malloc(sizeof(*xbe) * count, M_BINMISC, M_NOWAIT|M_ZERO);
411 if (!xbe) {
412 mtx_unlock(&interp_list_mtx);
413 return (ENOMEM);
414 }
415
416 xbep = xbe;
417 SLIST_FOREACH(ibe, &interpreter_list, link) {
418 error = imgact_binmisc_populate_xbe(xbep++, ibe);
419 if (error)
420 break;
421 }
422 mtx_unlock(&interp_list_mtx);
423
424 if (!error)
425 error = SYSCTL_OUT(req, xbe, sizeof(*xbe) * count);
426
427 free(xbe, M_BINMISC);
428 return (error);
429 }
430
431 /*
432 * sysctl() handler for munipulating interpretor table.
433 * Not MP safe (locked by sysctl).
434 */
435 static int
436 sysctl_kern_binmisc(SYSCTL_HANDLER_ARGS)
437 {
438 ximgact_binmisc_entry_t xbe;
439 int error = 0;
440
441 switch(arg2) {
442 case IBC_ADD:
443 /* Add an entry. Limited to IBE_MAX_ENTRIES. */
444 error = SYSCTL_IN(req, &xbe, sizeof(xbe));
445 if (error)
446 return (error);
447 if (IBE_VERSION != xbe.xbe_version)
448 return (EINVAL);
449 if (interp_list_entry_count == IBE_MAX_ENTRIES)
450 return (ENOSPC);
451 error = imgact_binmisc_add_entry(&xbe);
452 break;
453
454 case IBC_REMOVE:
455 /* Remove an entry. */
456 error = SYSCTL_IN(req, &xbe, sizeof(xbe));
457 if (error)
458 return (error);
459 if (IBE_VERSION != xbe.xbe_version)
460 return (EINVAL);
461 error = imgact_binmisc_remove_entry(xbe.xbe_name);
462 break;
463
464 case IBC_DISABLE:
465 /* Disable an entry. */
466 error = SYSCTL_IN(req, &xbe, sizeof(xbe));
467 if (error)
468 return (error);
469 if (IBE_VERSION != xbe.xbe_version)
470 return (EINVAL);
471 error = imgact_binmisc_disable_entry(xbe.xbe_name);
472 break;
473
474 case IBC_ENABLE:
475 /* Enable an entry. */
476 error = SYSCTL_IN(req, &xbe, sizeof(xbe));
477 if (error)
478 return (error);
479 if (IBE_VERSION != xbe.xbe_version)
480 return (EINVAL);
481 error = imgact_binmisc_enable_entry(xbe.xbe_name);
482 break;
483
484 case IBC_LOOKUP:
485 /* Lookup an entry. */
486 error = SYSCTL_IN(req, &xbe, sizeof(xbe));
487 if (error)
488 return (error);
489 if (IBE_VERSION != xbe.xbe_version)
490 return (EINVAL);
491 error = imgact_binmisc_lookup_entry(xbe.xbe_name, &xbe);
492 if (!error)
493 error = SYSCTL_OUT(req, &xbe, sizeof(xbe));
494 break;
495
496 case IBC_LIST:
497 /* Return a snapshot of the interpretor list. */
498
499 if (!req->oldptr) {
500 /* No pointer then just return the list size. */
501 error = SYSCTL_OUT(req, 0, interp_list_entry_count *
502 sizeof(ximgact_binmisc_entry_t));
503 return (error);
504 } else
505 if (!req->oldlen)
506 return (EINVAL);
507
508 error = imgact_binmisc_get_all_entries(req);
509 break;
510
511 default:
512 return (EINVAL);
513 }
514
515 return (error);
516 }
517
518 SYSCTL_NODE(_kern, OID_AUTO, binmisc, CTLFLAG_RW, 0,
519 "Image activator for miscellaneous binaries");
520
521 SYSCTL_PROC(_kern_binmisc, OID_AUTO, add,
522 CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_WR, NULL, IBC_ADD,
523 sysctl_kern_binmisc, "S,ximgact_binmisc_entry",
524 "Add an activator entry");
525
526 SYSCTL_PROC(_kern_binmisc, OID_AUTO, remove,
527 CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_WR, NULL, IBC_REMOVE,
528 sysctl_kern_binmisc, "S,ximgact_binmisc_entry",
529 "Remove an activator entry");
530
531 SYSCTL_PROC(_kern_binmisc, OID_AUTO, disable,
532 CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_WR, NULL, IBC_DISABLE,
533 sysctl_kern_binmisc, "S,ximgact_binmisc_entry",
534 "Disable an activator entry");
535
536 SYSCTL_PROC(_kern_binmisc, OID_AUTO, enable,
537 CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_WR, NULL, IBC_ENABLE,
538 sysctl_kern_binmisc, "S,ximgact_binmisc_entry",
539 "Enable an activator entry");
540
541 SYSCTL_PROC(_kern_binmisc, OID_AUTO, lookup,
542 CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_RW|CTLFLAG_ANYBODY, NULL, IBC_LOOKUP,
543 sysctl_kern_binmisc, "S,ximgact_binmisc_entry",
544 "Lookup an activator entry");
545
546 SYSCTL_PROC(_kern_binmisc, OID_AUTO, list,
547 CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_RD|CTLFLAG_ANYBODY, NULL, IBC_LIST,
548 sysctl_kern_binmisc, "S,ximgact_binmisc_entry",
549 "Get snapshot of all the activator entries");
550
551 static imgact_binmisc_entry_t *
552 imgact_binmisc_find_interpreter(const char *image_header)
553 {
554 imgact_binmisc_entry_t *ibe;
555 const char *p;
556 int i;
557 size_t sz;
558
559 mtx_assert(&interp_list_mtx, MA_OWNED);
560
561 SLIST_FOREACH(ibe, &interpreter_list, link) {
562 if (!(IBF_ENABLED & ibe->ibe_flags))
563 continue;
564
565 p = image_header + ibe->ibe_moffset;
566 sz = ibe->ibe_msize;
567 if (IBF_USE_MASK & ibe->ibe_flags) {
568 /* Compare using mask. */
569 for (i = 0; i < sz; i++)
570 if ((*p++ ^ ibe->ibe_magic[i]) &
571 ibe->ibe_mask[i])
572 break;
573 } else {
574 for (i = 0; i < sz; i++)
575 if (*p++ ^ ibe->ibe_magic[i])
576 break;
577 }
578 if (i == ibe->ibe_msize)
579 return (ibe);
580 }
581 return (NULL);
582 }
583
584 int
585 imgact_binmisc_exec(struct image_params *imgp)
586 {
587 const char *image_header = imgp->image_header;
588 const char *fname = NULL;
589 int error = 0;
590 size_t offset, l;
591 imgact_binmisc_entry_t *ibe;
592 struct sbuf *sname;
593 char *s, *d;
594
595 /* Do we have an interpreter for the given image header? */
596 mtx_lock(&interp_list_mtx);
597 if ((ibe = imgact_binmisc_find_interpreter(image_header)) == NULL) {
598 mtx_unlock(&interp_list_mtx);
599 return (-1);
600 }
601
602 /* No interpreter nesting allowed. */
603 if (imgp->interpreted & IMGACT_BINMISC) {
604 mtx_unlock(&interp_list_mtx);
605 return (ENOEXEC);
606 }
607
608 imgp->interpreted |= IMGACT_BINMISC;
609
610 if (imgp->args->fname != NULL) {
611 fname = imgp->args->fname;
612 sname = NULL;
613 } else {
614 /* Use the fdescfs(5) path for fexecve(2). */
615 sname = sbuf_new_auto();
616 sbuf_printf(sname, "/dev/fd/%d", imgp->args->fd);
617 sbuf_finish(sname);
618 fname = sbuf_data(sname);
619 }
620
621
622 /*
623 * We need to "push" the interpreter in the arg[] list. To do this,
624 * we first shift all the other values in the `begin_argv' area to
625 * provide the exact amount of room for the values added. Set up
626 * `offset' as the number of bytes to be added to the `begin_argv'
627 * area.
628 */
629 offset = ibe->ibe_interp_length;
630
631 /* Adjust the offset for #'s. */
632 s = ibe->ibe_interpreter;
633 while (1) {
634 s = strchr(s, '#');
635 if (!s)
636 break;
637
638 s++;
639 switch(*s) {
640 case ISM_POUND:
641 /* "##" -> "#": reduce offset by one. */
642 offset--;
643 break;
644
645 case ISM_OLD_ARGV0:
646 /* "#a" -> (old argv0): increase offset to fit fname */
647 offset += strlen(fname) - 2;
648 break;
649
650 default:
651 /* Hmm... This shouldn't happen. */
652 mtx_unlock(&interp_list_mtx);
653 printf("%s: Unknown macro #%c sequence in "
654 "interpreter string\n", KMOD_NAME, *(s + 1));
655 error = EINVAL;
656 goto done;
657 }
658 s++;
659 }
660
661 /* Check to make sure we won't overrun the stringspace. */
662 if (offset > imgp->args->stringspace) {
663 mtx_unlock(&interp_list_mtx);
664 error = E2BIG;
665 goto done;
666 }
667
668 /* Make room for the interpreter */
669 bcopy(imgp->args->begin_argv, imgp->args->begin_argv + offset,
670 imgp->args->endp - imgp->args->begin_argv);
671
672 /* Adjust everything by the offset. */
673 imgp->args->begin_envv += offset;
674 imgp->args->endp += offset;
675 imgp->args->stringspace -= offset;
676
677 /* Add the new argument(s) in the count. */
678 imgp->args->argc += ibe->ibe_interp_argcnt;
679
680 /*
681 * The original arg[] list has been shifted appropriately. Copy in
682 * the interpreter path.
683 */
684 s = ibe->ibe_interpreter;
685 d = imgp->args->begin_argv;
686 while(*s != '\0') {
687 switch (*s) {
688 case '#':
689 /* Handle "#" in interpreter string. */
690 s++;
691 switch(*s) {
692 case ISM_POUND:
693 /* "##": Replace with a single '#' */
694 *d++ = '#';
695 break;
696
697 case ISM_OLD_ARGV0:
698 /* "#a": Replace with old arg0 (fname). */
699 if ((l = strlen(fname)) != 0) {
700 memcpy(d, fname, l);
701 d += l;
702 }
703 break;
704
705 default:
706 /* Shouldn't happen but skip it if it does. */
707 break;
708 }
709 break;
710
711 case ' ':
712 /* Replace space with NUL to seperate arguments. */
713 *d++ = '\0';
714 break;
715
716 default:
717 *d++ = *s;
718 break;
719 }
720 s++;
721 }
722 *d = '\0';
723 mtx_unlock(&interp_list_mtx);
724
725 if (!error)
726 imgp->interpreter_name = imgp->args->begin_argv;
727
728
729 done:
730 if (sname)
731 sbuf_delete(sname);
732 return (error);
733 }
734
735 static void
736 imgact_binmisc_init(void *arg)
737 {
738
739 mtx_init(&interp_list_mtx, KMOD_NAME, NULL, MTX_DEF);
740 }
741
742 static void
743 imgact_binmisc_fini(void *arg)
744 {
745 imgact_binmisc_entry_t *ibe, *ibe_tmp;
746
747 /* Free all the interpreters. */
748 mtx_lock(&interp_list_mtx);
749 SLIST_FOREACH_SAFE(ibe, &interpreter_list, link, ibe_tmp) {
750 SLIST_REMOVE(&interpreter_list, ibe, imgact_binmisc_entry,
751 link);
752 imgact_binmisc_destroy_entry(ibe);
753 }
754 mtx_unlock(&interp_list_mtx);
755
756 mtx_destroy(&interp_list_mtx);
757 }
758
759 SYSINIT(imgact_binmisc, SI_SUB_EXEC, SI_ORDER_MIDDLE, imgact_binmisc_init, 0);
760 SYSUNINIT(imgact_binmisc, SI_SUB_EXEC, SI_ORDER_MIDDLE, imgact_binmisc_fini, 0);
761
762 /*
763 * Tell kern_execve.c about it, with a little help from the linker.
764 */
765 static struct execsw imgact_binmisc_execsw = { imgact_binmisc_exec, KMOD_NAME };
766 EXEC_SET(imgact_binmisc, imgact_binmisc_execsw);
Cache object: 45e3625aec236715b9cf2ef86a21d67f
|